抄録
With the recent progress in prefabricated buildings and in prestressed concrete structures, high strength concrete in stiff or stiff plastic consistency have been used in America and Europe, but in Japan, in building construction works, low strength concrete usually have been used in wet consistency. Therefore, it is practically ideal to use the high strength concrete in medium consistency for building construction. This study is carried out for the purpose of determing a proper limit between water cement ratio and unit cement content of high strength concrete cast in site having the strength of 300〜500kg/(cm)^2 at four weeks and slump of 10〜15cm, thus preventing the concrete from cracking due to its drying shrinkage and tensiel creep. In part 1, authors show the theoretical formulae of dry shrinkage, tensile creep coefficient, and compressive strengthe, thinking over many factors of water cement ratio, unit cement content, relative humidity, shape and size of member and loading age.
